Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C5/00—Alloys based on noble metals
  • C22C5/02—Alloys based on gold
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/84—Preparations for artificial teeth, for filling teeth or for capping teeth comprising metals or alloys
  • A61K6/844—Noble metals

Definitions

• the invention is directed to a copper free dental gold alloy based on silver-gold-palladium containing a relatively low gold content.
• dental alloys can be discolored in the mouth if local elements are formed which are traced back to differential aeration.
• differential aeration cells can form.
• the alloy components which are less noble than oxygen, as for example copper, can be dissolved there as ions. They wander to the cathodic region and then are deposited. Frequently, the thin precipitate is scarcely seen. Under the action of food and air it can change into plainly visible oxide and/or sulfide films. Also in telescopic work, the danger of coloration is present, since the primary part is always more poorly aerated than the secondary crown. The deciding role in this discoloration must be reduced to the copper of the alloy.
• alloys which consisted of 25 to 40% silver, 40 to 60% gold, 5 to 20% palladium, 0.05 to 0.5% iridium, 0 to 6% indium, 0 to 6% tin and 0 to 2% zinc with the proviso that the normal non-noble metals must total at least 2%.
• alloys that consisted of 28 to 35% silver, 50 to 58% gold, 5 to 10% palladium, 0.05 to 0.15% iridium, 2 to 5% indium, 0 to 3% tin and 0 to 1% zinc wherein the non-noble metal content is at least 4%.
• the dental alloys of the invention contain significantly less gold than the previously known copper free dental gold alloys and the expensive platinum is eliminated without the mechanical and chemical corrosion resistant properties falling out of the FDI specifications.
• the sum of the content of gold, palladium and iridium expressed in atomic percent is slightly over 50%, except in alloys 2, 3, 4 and 13 in which the sum is below 50%. Despite this relatively low content of gold, palladium and iridium, the alloys are corrosion resistant.
• the alloys are arranged in the FDI Specification No. 7 as Type I (soft), II (medium), III (hard) and IV (extra hard). Especially approved are alloys 3 (Type I), 5 and 6 (Type II), 7 and 10 (Type III), 13 and 14 (Type IV).
• compositions can consist essentially of or consists of the stated materials.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Chemical & Material Sciences (AREA)
• Veterinary Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Epidemiology (AREA)
• Plastic & Reconstructive Surgery (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Dental Preparations (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=5930717

Family Applications (1)

Country Status (6)

Cited By (12)

Families Citing this family (5)

Citations (5)

• 1974
  • 1974-11-13 DE DE2453799A patent/DE2453799C3/de not_active Expired
• 1975
  • 1975-11-04 US US05/628,766 patent/US4008080A/en not_active Expired - Lifetime
  • 1975-11-06 BR BR7507328*A patent/BR7507328A/pt unknown
  • 1975-11-12 CH CH1466075A patent/CH597353A5/xx not_active IP Right Cessation
  • 1975-11-13 JP JP50136754A patent/JPS5172921A/ja active Pending
  • 1975-11-13 FR FR7534691A patent/FR2291282A1/fr active Granted

Patent Citations (5)

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